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What is an oxygen debt?

Anaerobic respiration occurs when there is no oxygen available and so produces an oxygen debt. This debt is equivalent to the total amount of oxygen required to oxidise the lactic acid formed from this proce...
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Answered by Grace J. • Biology tutor
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How can leaching cause bad smells in lakes?

Leaching is the process by which nitrates and other organic molecules can reach lakes from fields. This may be due to a large amount of fertiliser being applied or heavy rain causing the fertiliser to wash i...
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Answered by Joe R. • Biology tutor
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What is the difference between aerobic and anaerobic respiration?

Respiration refers to the process of converting food substances such as glucose into energy which the cell can use. There are two types of respiration - aerobic and anaerobic respiration. Both these processe...
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Answered by Grace J. • Biology tutor
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Explain eutrophication and why it can lead to the death of invertebrates and fish in rivers.

Eutrophication is due to high levels of nutrients (nitrates) in the water. This leads to increased growth of algae and other plants which leads to "algal blooms". This is where the surface of the w...
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Answered by Ashleigh E. • Biology tutor
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What is the difference between an ectotherm and an endotherm?

Ectotherms, including reptiles and amphibians, are organisms that don't possess the ability to generate sufficient heat to keep themselves warm. As such, they are dependent on environmental sources of heat, ...
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Answered by Ed S. • Biology tutor
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